Pedal actuated elevating truck



Patented July 19, 1932 UNITED STATES PATENT OFFICE FRED V HAMHE'R LY, OFBERKELEY, CALIFORNIA, ASSIGNOR OF ONE-BAH GEORGIA A. HAIMEBLY ANDONE-HALF 1'0 CARROLL B. ABBOTT, BOTH OF BERKELEY, CALI- FOBNIA APPARATUSEOB MIXING FLUIDS Application filed August 18, 1930. Serial No. 475,928.

My invention relates to an apparatus for mixing fluids, and particularlyto such an apparatus for mixing liquids and gases.

It is among the objects of my inventlon to provide an apparatus in whichcontrolled amounts of a gas are thoroughly mixed with a liquid.

Other objects of my invention include the provision of an apparatus inwhich a liquid 10 is repeatedly moved in an agitated stream,

into which a gas is injected; thereby maintaining the liquid in a stateof complete saturation with the gas at all times.

A further objectof my invention is to providean apparatus which willexpedite the biological purification of sewage.

The invention possesses numerous other objects and features ofadvantage, some of which, with the foregoing, will be set forth in thefollowing description of my invention.

It is to be understood that I do not limit my-' self to this disclosureof species of my invention, as I may adopt variant embodiments thereofwithin the scope of the claim.

Referring to the drawing:

' Figure 1 is a horizontal sectional view of the apparatus embodying myinvention, taken method is not without its disadvantages, however, dueto the slowrate at which the bacteria normally do their work, and thelarge volumes of raw sewage which have to be treated. When the apparatusfor mixing fluids embodying my invention isused in this connection thesewage is maintained in a state as sewage. Means are provided forinitiating an upwardly moving stream within the tank to circulate andagitate the liquid; and means are provided for introducing a gas, suchas air, into the stream. Means are also provided for distributing themixed fluids on the surface of liquid in the tank; and means are pro-'vided for removing a liquid, such as the purified sewage, from the tank.

In greater detail, the apparatus for mixing fluids embodying myinvention comprises a tank 2, which may conveniently be made of in aplane indicated by the line 1-1 of Figconcrete, having a basin-shapedbottom. Exure 2; and

tending across the top of the tank 2 are a pair 30 Figure 2 is avertical sectional view of the same, taken in a plane indicated by theline 22 of Figure 1.

In the following description the apparatus for mixing fluids embodyingmyinvention will be described in connection with the aera-' tion ofsewage. It is understood, however, that this particular application ofthe apparatus is merely taken for the purposes of illustration, and thatthe apparatus may be used 10 to equal advantage for eflectin-g themixture tion has proved to be most effective. This of girders 3supporting a platform 4, upon which is mounted a vertical shaft motor 6.

Located centrally of the tank is an inverted funnel 7, preferablyarranged so that its neck 8 is positioned adjacent the center of thetank. The funnel is secured to the tank bottom, and is spaced therefromby a series of legs 9 to provide an opening 11. The throat end of aVenturi tube 12 is connected with the funnel neck 8, and the tubeextends upwardly and opens adjacent the top of the tank below the normallevel of the tank liquid or sewage sludge 13.

-Meaus are provided for initiating a movement in the sludge, to producean upwardly moving stream directed thru the funnel 7 and July 19, 1932.

D. E. HENNESSY PEDAL ACTUATED ELEVATING TRUCK Filed June 20, 1929 2Sheets-Sheet 2 mm MFR lnv e nTor.

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Patented July 19, 1932 UNITED STATES PATENT OFFIQE DANIEL E. HENNESSY,OF VJA'IERTOW'N, MASSACHUSETTS, ASSIGNOR TO LEWIS-SHE}?- ARD COMPANY, OFWATERTOWN, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS Applicationfiled June 20,

This invention relates to improvements in elevating trucks in whichmeans are provided for raising and lowering the load supporting means sothat the truck may be introduced beneath the platform supporting thearticles to be transported, or beneath the article itself, and the loadsupporting means thereupon raised a sufficient istance to remove theplatform or article from the floor, and thereby enabling the same to betransported by the truck and deposited in a desired place by loweringthe load supporting means of the truck.

The principal object of the invention is to provide an improved meansfor raising the load supporting means.

The load support-ing means of elevating trucks of the type abovedescribed have heretofore been raised by mechanism operated by adownward swinging movement of the tongue from approximately verticalposition to substantially horizontal position. In operating suchconstructions the operator is required to pull forwardly upon the tonguewhile placing his foot against the front end of the truck to preventforward movement thereof. As a consequence the power which he is enabledto apply to the tongue is greatly limited with respect to that whichwould be applied if he were able to throw his full weight upon thetongue when the latter is in an advantageous lifting position.

in usual types of elevating trucks the load supporting means is carriedupon parallel links, or the equivalent thereof, and during the initiallifting movement the pivots for the upper ends of the parallel linksmove through a portion of an are which is approximately vertical, whileduring continued movement the path of movement of the pivots approachthe horizontal. its a consequence, the leverage required during theinitial lifting movement is very much greater than that which isrequired during the continued lifting movement. Furthermore, thefrictional resistance of the relatively movable parts of the mechanismis much greater at the starting of the lifting movement than during thecontinu- 1929. Serial N0. 372,372.

ation thereof. In order, therefore, to enable the operator to lift aheavy load, it has been necessary to employ a tongue of the maximumlength which can be efliciently actuated by operators of usual size andweight.

hen such a tongue is in a raised position approximating a verticalposition, the usual horizontal handles of the tongue are approximatelyat the height of the shoulders of the operator, so that the power whichthe operator can apply to start the lifting of the load supportingmeans, where the greatest resistance is oli'ered, is much less than thatwhich may be applied by him as the tongue sufficiently approacheshorizontal'posit-ion to enable him to bear his weight upon it.

It is obvious that the force applied to a movable object by the momentumof the weight of a moving body greatly exceeds the static force of thesame weight when imposed upon the object. The principal object of thepresent invention is to provide an elevating truck with liftingmechanism for the load supporting means operable by a lifting leverhaving means so positioned as to permit the operator to project his fullweight upon it, whereby the initial lifting force, applied by themomentum of the full weight of the operator to start the liftingmechanism from a position of rest, will greatly exceed that which wouldbe produced by the static application of the weight of the operatoralone, while the lifting movement will thereafter be effectivelycontinued by the weight of the operator, by reason of the moreadvantageous positions of the lifting mechanism, so that heavy loads canbe lifted without undue exertion upon the part of the operator.

A further object of the invention is to provide means for applying thelifting force symmetrically with respect to the longitudinal axis of theload supporting means, thereby preventing racking of the load supportingmeans which usually is in the form of a rectangular frame.

A further object of the invention is to provide an elevating truckhaving load supporting means mounted upon parallel links, or

equivalent devices, which cause the load supporting means to be elevatedby a longitudinal movement thereof, with a foot operated lifting leverfulcrumed below and preferably beneath the load supporting means, andpro vided with means operable upon depression of the lever to exert athrust upon an end of the load supporting means at such angle to thehorizontal that the lever will act both directly to lift the loadsupporting means and to move it longitudinally.

A further object of the invention is to provide an elevating truck witha foot-operated lifting lever fulcrumed below the load supporting meansand having means to exert a lifting thrust upon the load supportingmeans at points substantially equidistant from the longitudinal centerof the load supporting means, thereby increasing the rigidity of thelifting mechanism and avoiding twisting strains.

A further object of the invention is to provide an elevating truck ofthe character above described having a foot lever operable to elevatethe load supporting means step by step.

A further object of the invention is to provide an improved means forlocking the load supporting means when the load supporting means is in apredetermined elevated position, or in predetermined elevated positions.

Another object of the invention is to provide locking means having aplurality of locking dogs operable to engage the load supporting meansat points substantially equidistant from the longitudinal axis of theload supporting means, whereby racking strains will be avoided both uponrelease of the elevating means and during the transportation of theloaded truck.

A further object of the invention is to provide an elevating truck inwhich the load supporting means is mounted upon parallel links with afoot-operated lever for lifting the load supporting means, having pawlsprovided with a plurality of teeth positioned to engage extensions ofthe pivots of the upper ends of the links, and a further object of theinvention is to provide a locking device having a plurality of lockingdogs positioned also to engage the pivotal connection of the parallellinks at approximately equal distances from the longitudinal center ofthe load supporting means.

Another object of the invention is to provide an elevating truck of thecharacter above described provided with a substantially vertical dashpot to cushion the downward movement of the load supporting means whenreleased from elevated position.

Another object of the invention is to provide an elevating truck of thecharacter described having a relatively narrow main frame provided atits front end with a steering head, and at its rear end with an axlehaving the rear wheels mounted at the outside of the frame, andcomprising a load supporting means which is of considerably greaterwidth than the width of the main frame.

A further object of the invention is to provide an elevating truck ofthe character specitied of great rigidity and higher efficiency andwhich can be economically constructed.

These and other objects and features of the invention will more fullyappear from the following description and the accompanying drawings andwill be particularly pointed out in the claims.

In the drawings:

Fig. 1 is a side view of an elevating truck embodying a preferred formof the invention;

Fig. 2 is a detail side view illustrating the front portion of the truckas viewed form the opposite side, the handle and rear portion of thetruck being omitted;

Fig. 3 is a plan view of the elevating truck illustrated in Fig. 1;

Fig. 4 is a detail view in perspective showing the lifting pawls andtheir connection to the lifting lever; and

Fig. 5 is a detail view in perspective of the locking device.

The elevating truck embodying the invention comprises a load supportingmeans, which preferably is in the form of a rectangular skeleton frameso supported as to be raised upon longitudinal movement thereof, with afoot lever for raising the load supporting means having means operableto engage one end, preferably the front end, of the load supportingmeans from beneath, and upon downward movement of the foot lever toexert an upward and longitudinal thrust upon it, with means for lockingthe load sup porting means in a predetermined elevated position, orpredetermined elevated positions.

In the particular construction illustrated the elevating truck comprisesa head 1, which desirably is in the form of an arch having mountedcentrally therein a steering post 2 provided at its lower end with ayoke having arms 3 with bosses 4: at their lower ends in which the axle5 of a steering wheel, or plurality of steering wheels 6, is mounted.The upper end of the steering post has secured to it a split collar 7provided with upwardly extending ears 8 in which is mounted a shaft 9which forms the pivot of a vertically swinging steering tongue 10. Thesteering tongue 10 is provided at its lower end with an extension whichengages the upper end of the split collar 7 thereby preventing thetongue from being moved any considerable distance beyond a verticalposition and holding the tongue in upraised position.

Side bars 11 and 12, which are suitably secured at their front ends tothe head 1 by bolts, rivets, or by welding, extend rearwardly from saidhead, preferably in parallelism,

and are provided respectively with preferably offset ends or brackets 13and 14 in which the rear axle 15 of the truck is mount ed. The head andside bars forming the frame may be relatively narrower than usual typesof trucks and the rear wheels 16 and 17 are rotatably mounted on saidaxle outside of the side bars 12 and 13 of the frame, thus providing awide wheel support for the rear end of the truck.

The load supporting means, which, as illustrated, is in the form of arectangular skeleton frame, but which may of course be pro vided with afloor, is supported upon the frame by parallel links. In the preferredconstruction illustrated the load supportlng means comprisess parallelside bars 18 and 19 located outside of the rear wheels 16 and 17connected at their rear end by a transverse bar or girder 20 preferablyin the form of a channel bar, and at their front ends connected by arigid head 21, preferably having a horizontal flange 22 and a verticalweb or flange 23 provided with an upwardly extending standard 24 havingat its upper end a rearwardly extending arm 25 adapted to be connectedto the piston 26 of a substantially vertical dash pot 27 the lower endof which is pivotally connected to a bracket 28 upon a cross girder 29of the main frame.

The head 21 of the load supporting means is also provided with forwardextensions 30 which carry the pivots for the upper ends of the frontpair of parallel links 31. Desirably the lower ends of the front pair oflinks 31 are fixedly secured, as by welding, to a sleeve 32 which isrotatably mounted upon a shaft 33, the ends of which are mounted independing portions of the side bars 11 and 12 of the frame, or inbrackets depending therefrom. The upper ends of the links 31 arepivotally mounted, preferably upon a rod 34 which desirably is rotatablymounted in the extensions 30 of the head of the platform,

- and may also be mounted in a depending portion of the standard 24. Thepivots for the upper end of the link, or in other words the pivotal rod34, extend well beyond the links, and such extensions in the preferredconstruction illustrated are engaged by the lifting mechanism andpreferably also by the locking mechanism as will hereinafter more fullyappear.

The parallel link, which raises the rear I end of the load supportingmeans, as illustrated herein, is of very rigid construction, andcomprises a pair of outer links 35 and 36 which are rigidly connected,as by welding, at their upper ends to a sleeve 37 which is rotatablymounted upon a shaft 38, the ends of which extend through and preferablyare welded to the side bars 18 and 19 of the load supporting means. Thelower ends of the links 35 and 36 are pivotally mounted upon the rearaxle 15 and desirably are provided with outwardly extending bosses 39which underlie the side bars 18 and 19 respectively of the loadsupporting means and support the rear end of said load supporting meanswhen it is in lowered position.

Other links 40 and 41, which are rigid with and preferably welded attheir upper ends to the sleeve 37 are rigidly connected at the lowerends to a sleeve 42 which is rotatably mounted upon the axle 15, thelinks 40 and 41 being preferably so positioned that they engage theinner faces of the oifset extensions 13 and 14 of the side bars 11 and12 of the main frame.

The lifting and locking mechanism which are the more prominent featuresof the invention comprise a foot lever which is fulcrumed below andpreferably beneath the front end of the load supporting means having along arm provided with a pedal and a relatively short arm which actsdirectly through upwardly inclined thrust members to apply a liftingforce upwardly and forwardly to raise the end of the load supportingmeans. The thrust members desirably engage the extended pivots of theupper ends of the forward parallel links at equal distances from thelongitudinal axis of the load supporting means, thereby exerting forcesupon the load supporting means which avoid subjecting the loadsupporting means to twisting or racking strains. Desirably these thrustmembers are in the'form of pawls having a plurality of shoulders toengage the pivot extensions, so that the load supporting means may beraised step by step.,

The locking device desirably is foot operated and comprises dogs havingteeth positioned to engage the extensions of the pivots for the upperends of the parallel links at equal distances from the longitudinal axisof the load supporting means, thus avoiding the application of twistingor racking strains upon the load supporting means and main frame whenthe load supporting means is locked in elevated position.

In the particular construction described the lifting lever is in theform of a foot lever 43 which is fixedly secured, as by welding, to atransverse shaft 44 which is rotatably mounted in suitable bearings inthe depending portions of the side frames 11 and 12. The long arm of thelever 43 is provided at its front end with a pedal 45 so located thatthe operator may readily throw his full weight upon it particularlywhile grasping the tongue to steady himself when the tongue is in thevertical position illustrated in Fig. 1. The lifling lever has a shortarm 46 which preferably is integral with it and extends at an angle tothe longitudinal axis of the long arm of the lever. The shaft 44 hassecured to it at its opposite end a short arm 47 which is parallel toand of equal length to the short arm 46. Pawls 48 and 49 are pivotallyconnected at their lower ends to the arms 46 and 47 and are providedwith teeth presenting shoulders 50 and 51. The under faces 52 of thepawls normally engage end portions of the rod 34 which forms the pivotfor the upper ends of the front parallel links 31.

Resilient means, such as a spring 53, which is connected at one end toan arm 54 upon the shaft 44 and at its other end to a stud 55 upon themain frame, serves normally to hold the foot lever 43 in elevatedposition, and

studs 56 extending outwardly from the pawls 48 and 49 are adapted to beengaged by the short arms of the lever in such a manner as to hold thepawls in elevated position out of the path of the ends of the shaft 34during the lowering of the load supporting means from elevated position.

The preferred form of locking mechanism illustrated herein comprises anintegral foot lever 57, (see Figs. 3 and 4) having at its front end a.pedal 58 and a downwardly offset portion 59 connected by a cross bar 60to aforwardly extending arm 61 which is parallel to the offset portion59. The members 59 and 61 are pivotally mounted upon studs 62 and 63which extend respectively from bosses 6 4 and 65 upon the head 1.Locking dogs 66 and 67, which are integral with the foot lever 57 andits cross bar 60, extend rearwardly and are provided with a plurality ofteeth 68 and 69 adapted to engage the extensions of the rod 34 whichconstitute a pivot for the upper ends of the front links 31. The dogs 66and 67 are so disposed as to engage the rod 34 at points substantiallyequal distances from the longitudinal center of the load supportingmeans as above described, thereby avoiding the application of twistingstrains to the load supporting means or to the frame when the loadsupporting means is in an elevated position. v

In operation the truck with the load supporting means in loweredposition is backed beneath the platform containing the articles to betransported or beneath thearticle itself when supported upon legs orblocks. lVhen the load to be lifted is heavy the operator places hisfoot upon the pedal 45 and jumps, or otherwise projects his full weightupon the pedal, thereby exerting the increased force of the momentum ofhis body to the pedal. As the pedal is depressed by the force thusprojected upon it, the short arms 46 and 47 of the lifting lever forcethe pawls 46 and 49 forwardly and upwardly causing the shoulders 51 ofthe pawls to engage the end portions of the rod 34, thereby exertingdirectly a lifting force upwardly and forwardly upon the load supportingmeans and causing the paral lel links to swing forwardly upon theirpivots. The increased force produced by the impetus of the weight of theoperator readily moves the upper ends of the links through the morevertical portions of the arc of their movements and the progressivelyincreasing effective leverage of the lifting lever as its longer armapproaches more nearly the horizontal and the arc of movement of theupper pivots of the links approach horizontal, is ample to continue thelifting movement of the load supporting means during the remainder ofthe movement of the lifting lever.

The lifting lever may be depressed until the pedal end thereof engagesthe floor, at which time the tooth 68 of the locking dog will engage therod 34, which forms the pivot for the upper ends of the front links,thereby locking the load supporting means at the end of its first stepof elevation. The lifting lever may then be released and when releasedwill be drawn by the spring 53 to its normal raised position. As thelifting lever is thus raised by the spring the shoulders 50 in the pawls48 and 49 will engage the rod 34 so that upon subsequent downwardpressure of the lifting lever by the foot of the operator, the shoulders50 will engage the rod 34 and again exert an upward and forward thrustupon the front end of the load supporting means, thus raising the sameto its maximum elevation in which the front links 31 are approximatelyvertical. During the further upward and forward movement of the loadsupporting means thus described the rod engages the inclined faces 70 ofthe teeth 69 and riding under them raise the dogs until at the end ofthe upward and forward movement of the rod 34 it is engaged by the teeth69 and locked in elevated position, as shown in Fig. 2.

The loaded truck is then in position to be transported to itsdestination.

In order to provide for lifting exceedingly heavy loads, the shaft- 44may be extended, as illustrated in 3, suiiiciently to enable a bar 71 tobe placed beneath it and across the top of the pedal 45, so that anincreased leverage may be applied to the pedal sutlicicntly to lift anyload within the capacity of the truck.

Upon reaching its destination the operator places his foot upon thepedal 58 of the looking dog and depresses the same, thereby releasingthe locking dogs from engagement with the rod 34 and permitting thedescent of the load supporting means. By rotatably mounting the rod 34in the extensions 30 of the head of the load supporting means, a slightrotation of the rod 34 is permitted during the lifting of the truckwhich reduces friction and prevents wear upon particular portions ofsaid rod. The rotatability of this rod also facilitatesthe release ofthe locking dogs when the load supporting means is in elevated position,and in turn avoids undue wear upon the portions of the rod engaged bythe teeth of the locking dog. 7

Rapid descent of the load supporting means is prevented by the dash pot27.

It will be noted that the dash pot in the present embodiment of theinvention is in a substantially vertical position so that leakage of thefluid is effectively prevented.

It will be obvious to those skilled in the art that the elevating truckabove described is of economical construction; that the parts are of arigid character, and that the force which may be applied by projectingthe weight of the operator upon the pedal, in the manner abovedescribed, is far greater than could be otherwise applied by an operatorof hand levers, such as tongues, of equal length.

Trucks embodying the present invention may be provided with shortersteering tongues than those of like capacity heretofore constructed,thereby greatly adding to the convenience of manipulation of the truck.Such shorter tongues will also enable the operator when standing uponthe pedal of the lifting lever and grasping the usual transverse handlesof the tongue to exert a pull upon the handles which will increase theforce applied by his weight to the lifting lever.

In view of the fact that the lifting mechanism is wholly detached fromthe load supporting means, when the load supporting means is in elevatedposition, there is no danger to the operator by a flying tongue when thelocking device is released to permit the descent of the load.

A further safety against injury to the operator is provided by reason ofthe fact that in lifting the load the operator throws his weight uponthe pedal and not against the tongue, thus avoiding injuries which havesome times occurred by failure of the tongue properly to engage thelifting mechanism which will permit the operator to fall backwardly ashe exerts the initial pull upon the tongue to lift the load.

It will also be recognized by those skilled in the art that theapplication of lifting forces symmetrically with respect to thelongitudinal axis of the load supporting means, and also the locking ofthe load supporting means at points equidistant from the longitudinalaxis of the load supporting means will avoid distortion of the loadsupporting means and of the truck, thereby increasing its length oflife.

It will be understood that the particular embodiment of the inventiondisclosed herein is of an illustrative character and is not restrictive,and that various changes in form, construction and arrangement of partsmay be made within the spirit and scope of the following claims.

Having thus described the invention, what is claimed as new, and desiredto be secured 69 by Letters Patent, is:

1. An elevating truck comprising a frame, load supporting means movablelongitudinally relatively thereto, means operable upon longitudinalmovement of said load supporting means to move the same verticallyrelatively to said frame and mechanism for moving said load supportingmeans longitudinally including a foot lever fulcrumed upon said framehaving a pedal so positioned as to permit the operator to protect hisfull weight upon it, and a pawl operable by the depression of said pedalhaving means detach ably to engage said load supporting means and movethe same longitudinally of the said frame.

2. An elevating truck comprising a frame, load supporting meansconnected thereto by parallel links and mechanism for lifting said loadsupporting means including a foot lever fulcrumed beneath said loadsupporting means having a pedal so positioned as to permit the operatorto project his full weight upon it and a pawl, operable by thedepression of said pedal, having means detachably to engage said loadsupporting means and move the same longitudinally of said frame.

3. An elevating truck comprising a frame, steering mechanism, loadsupporting means, and parallel links connecting said load supportingmeans to said frame, a foot lever fulcrumed on said frame beneath saidload supporting means and having a pedal so positioned as to permit theoperator to project his full weight upon it and means operable by thedepression of said pedal to exert a thrust upon one end of said loadsupporting means at an angle to the horizontal acting both to lift saidend andto move said load supporting means longitudinally of the framewhereby the initial lifting force applied by the momentum of the fullweight of the operator to said pedal to start the lifting mechanism froma position of rest will exceed that produced by the static applicationof the weight of the operator alone to said foot lever.

4;. An elevating truck comprising a frame, steering mechanism, loadsupporting means and means operable upon relative longitudinal movementof said load supporting means and said frame to raise said loadsupporting means, a foot lever fulcrumed on said frame below said loadsupporting means to swing vertically and means operable by thedepression of said lever to exert force upon one end of said loadsupporting means at an angle inclined to the horizontal and at pointssubstantially equidistant from the longitudinal axis of said loadsupporting means acting said end and move said load su porting meanslongitudinally of the frame and avoiding racking strains during thelifting of said load supporting means.

5. An elevating truck comprising a frame, steering mechanism, loadsupporting means and means operable upon relative longitudinal movementof said load supporting means and said frame to raise said loadsupporting means, a foot lever fulcrumed on said frame below said loadsupporting means to swing vertically and means operable by thedepression of said lever to exert force upon one end of said loadsupporting means at an angle to the horizontal and at pointssubstantially equidistant from the longitudinal axis of said loadsupporting means acting both to lift said end and move said loadsupporting means longitudinally of the frame and cooperating lockingmeans on said load supporting means and frame positioned mutually toengage at points substantially equidistant from the longitudinal axis ofsaid load supporting means whereby racking strains will be avoided.

6. An elevating truck comprising a frame, steering mechanism, loadsupporting means and means operable upon relative longitudinal movementof said load supporting means and said frame to raise said loadsupporting means, a foot lever fulcrumed on said frame beneath said loadsupporting means to swing vertically, a pawl pivotally mounted on theshort arm of said lever having means detachably to engage said loadsupporting means operable upon depression of said lever to exert a forceupon an end of said load supporting means at an angle to the horizontalacting both to lift said end and to move said end longitudinally of saidframe and releasable locking means for holding said load supportingmeans in elevated position.

7. An elevating truck comprising a frame, steering mechanism, loadsupporting means and means operable upon relative longitudinal movementof said load supporting means and said frame to raise said loadsupporting means, a foot lever fulcrumed on said frame beneath said loadsupporting means to swing vertically, a pawl pivotally mounted on theshort end of said lever having means detachably to engage said loadsupporting means operable upon depression of said lever to exert a forceupon an end of said load supporting means at an angle to the horizontalacting both to lift said end and to move said end longitudinally of saidframe and releasable locking means for holding said load supportingmeans in elevated position and a dash pot connected to said loadsupporting means and said frame acting to prevent rapid descent of saidload supporting means upon release of said locking means.

8. An elevating truck comprising a frame, load supporting mechanism,parallel links pivotally connected to said frame and said loadsupporting means, the pivots of said front pair of links extendingbeyond said links, a foot lever having a rigid fulcrumshaft journalledin said frame, short lever arms rigid with said shaft locatedsubstantially equidistant from the longitudinal'axis of said lo-ad'supporting means, pawls pivotally connected to said short lever armsdetachably engaging the extended pivots of said front links operableupon depression of said foot lever to elevate said load supportingmeans, and releasable means for locking, said load supporting means in apredetermined elevated position. i

9. An elevating truck comprising a frame, load supporting means,parallel links pivotally connected to said frame and said loadsupporting means, the pivots of said front pair of links extendingbeyond said links, a foot lever having a rigid fulcrum-shaft ournalledin said frame, short lever arms rigid with said shaft locatedsubstantially equidistant from the longitudinal axis of said loadsupporting means, pawls pivotally connected to said short lever armshaving a plurality of teeth detachably engaging the extended pivots ofsaid front links operable upon successive depressions of said foot leverto elevate said load supporting means step by step, means for lockingsaid load supporting means at eachstep of elevation and means forraising said foot lever when the load supporting means is in lockedposition to move said pawls out of effective engagement with said pivotextensions.

10. An elevating truck comprising a frame, load supporting mechanism,parallel links pivotally connected to said frame and said loadsupporting means, the pivots of said front pair of links extendingbeyond said links, a foot lever having a rigid fulcrumshaft journalledin said frame, short lever arms rigid with said shaft locatedsubstantially equidistant from the longitudinal axis of said loadsupporting means, pawls pivotally connected to said short lever armsdetachably engaging the extended pivots of said front links operableupon depression of said foot lever to elevate said load supportingmeans, releasable means for locking said load supporting means in apredetermined elevated position, and a substantially Vertical dash potclosed at its bottom having its piston and cylinder pivotally connectedrespectively to said load supporting means and to said frame.

11. An elevating truck comprising a frame, load supporting mechanism,parallel links pivotally connected to said frame and said loadsupporting means, the pivots of said front pair of links extendingbeyond said links, a foot lever having a rigid fulcrumshaft journalledin said frame, short lever arms rigid with said shaft locatedsubstantially equidistant from the longitudinal axis of said loadsupporting means, pawls pivotally connected to said short lever armsdetachably engaging the extended pivots of said front links operableupon depressionof said foot lever to elevate said load supporting means,and a foot-operated lock pivotally mounted on said frame having tootheddogs positioned detachably to engage the extended pivots of said frontlinks at substantially equal distances from the longitudinal axis of theload supporting means.

12. An elevating truck comprising a frame, load supporting means,parallel links pivotally connected to said frame and said loadsupporting means, the pivots of said front pair of links extendingbeyond said links, a foot lever having a rigid fulcrumshaft journallcdin said frame, short lever arms rigid with said shaft locatedsubstantially equidistant from the longitudinal axis of said loadsupporting means, pawls pivotally connected to said short lever armshaving a plurality of teeth detachably engaging the extended pivots ofsaid front links operable upon successive depressions of said foot leverto elevate said load supporting means step by step, and a foot-operatedlever pivotally mounted on said frame having dogs resting by gravity onthe extended pivots of said front links and provided with a plurality ofteeth adapted respectively to engage said pivots upon successive stepsof elevation of said load supporting means.

13. An elevating truck comprising a frame having a narrow head, steeringmechanism mounted in said head, side bars extending rearwardly from saidhead in substantial parallelism, an axle mounted in the rear portion ofsaid side bars, wheels mounted on said axle outside of said side bars,load supporting means of relatively greater width than said framesupported by parallel links thereupon, a foot lever mounted on saidframe and means operable by the depression of said foot lever detachablyto engage said load supporting means at points outside of said frame atpoints equidistant from the longitudinal axis of the frame, and meansfor locking the load supporting means in elevated position uponactuation of said foot lever.

14. An elevating truck comprising a frame, load supporting means havinga transverse horizontal shaft rotatably mounted in the front endthereof, parallel links pivotally connected to said frame and to saidshaft, a foot lever having a rigid fulcrumshaft journalled on said framebelow said load supporting means with similar short lever arms rigidwith said fulcrum shaft, pawls pivotally mounted on the respective leverarms provided with shoulders to engage said platform shaft uponactuation of said foot lever to raise said load supporting means and alocking dog pivotally mounted on said frame having shoulders to engagesaid rotatable platform shaft when the load supporting means is raisedto a predetermined height.

15. An elevating truck comprising a frame, load supporting means,parallel links connected to said load supporting means and said frame, afoot lever having a rigid fulcrumed shaft ournalled in said frame belowsaid load supporting means having at the end of its long arm a pedal andmeans connected to its short arm operable to engage the front end ofsaid load supporting means and exert a force upon the front end of theload supporting means at an angle to the horizontal acting both to liftsaid end and to move said load supporting means longitudinally I DANIELE. HENNESSY.

CERTIFICATE OF CORRECTION.

Patent No. 1,867,825. July 19, 1932.

DANIEL E. HENNESSY.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 5,line 119, claim 4, before "lift" insert the words both to; and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 4th day of October, A. D. 1932.

M. J. Moore,

(Seal) Acting Commissioner of Patents.

